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NITED ALBERT SOHIFFLING, OF INDIANAPOLIS, INDIANA, ASSIGNOB OF TWO-THIRDS OF HIS RIGHT TO EWALD OVER, OF SAME PLACE.

SURFACE-GAGE.

SPECIFICATION forming part of Letters Patent No. 225,950, dated March30, 1880.

Application filed December 22, 1879.

To all whom it may concern:

Be it known that I, ALFRED SOHIFFLING, of Indianapolis, in the county ofMarion and State of Indiana, have invented a new and useful Improvementin Surface-Gages for Machinists, of which the following is adescription, reference being had to the accompanying drawings.

The object of my invention is to provide a surface-gage for machinistswith an adjustment screw, by means of which the index or measuring pointmay be gradually moved and set for the accurate measurement of surfaces.

My invention consists, mainly, in providing the movable slide of asurface-gage with an adjustable device for the adjustment of theindex-point, and in the new combination of elements, as will behereinafter fully described, and specially set forth in the claim.

In the accompanying drawings,in which like letters of reference in thedifferent figures indicate like parts, Figure 1 represents an elevationof my improved gage, and Fig. 2 is a top view of the same.

Referring now to the drawings, A represents a base, in which thestandard B is firmly secured at right angles to the line of the base inthe ordinary manner. The upper end, f, of the standard B is made sharpto answer as a center-point, the use of which will be hereinafterdescribed.

The adjustable slide 0 O G is constructed similar to that shown in thedrawings-that is, the slide 0 is nearly straight, and its ends projecton both sides of the standard 13 far enough to receive the binding-screwD at the front end and the studs a and R of the adjusting device for theindex-point at the other end.

The other side, 0, of the clamp is connected with the side 0 by the band0 which clasps the standard 13, thus forming a clamp that can beadjusted as required.

The binding-screw D passes through the sides 0 and G, and the slide ismade fast at any point of adjustment by the thumb-nut O, which has awasher, I), between it and the outer side of the clamp-side G.

The index point or arm G has a curved end, G, in the ordinary manner,for indicating any irregularity of surfaces. This curved end Gr may bemade to receive a pencil, and used either with a pencil or without, inconnection with the point f of the standard, to form a pair of compassesby inverting the gage. The index point or arm G is inserted in thecylinder E of the pivoted adjustable T-shaped device H, and secured atany required extension by the binding-screw F.

The adjustable T-shaped device H is constructed as follows: The arm H isprovided with'a pivot, to, about midway of its length, which is securedto the side G of the slide, as shown. The upper end is provided with thecylinder E and binding-screw F, and the lower end is provided with apivoted lug, I, as shown.

The adjusting-screw J L is mounted in the head K of the stud E and heldin position by the collar t" and head L of the screw. The screw Joperates in a screw threaded hole formed in the lug I, as shown.

The operation of my improved surface-gage for machinists is as follows,to wit: The base is placed on the work, and the slide 0, with theindex-arm G, adjusted up and down in the ordinary manner; but the fineadjustment of the part G is made by operating the screw J L-that is, byturning the milled thumbscrew from the operator the T-headed pivoteddevice EH is brought toward a perpendicular position and the part Gadjusted down; by reversing the motion of the said screw the device E His inclined from a perpendicular line and the part G is raised. It isobvious that this manner of adjustment is far superior and more accuratethan heretofore, where the slide only can be adjusted.

If it is desired to use the instrument for laying off circles, then, byreversing the part G of-the index-arm, it becomes one leg of a compass,while the point f of the standard becomes the other leg, and the size ofthe circle can be had by adjusting the arm G in the cylinder E to therequired distance.

Having thus described my invention, what I claim as new is-- The slidecomposed of the parts 0 0 G to this specification in the presence of twosubas described, combined with the pivoted T- scribing Witnesses.

shaped device E H the pivoted lug I the stud K R, and the screw J L,whereby the slide ALBERT SGHIFB LING 5 and index-arm G may be adjusted,substan- Witnesses:

tially as shown and described. E. O. FRINK,

In testimony whereof I have signed my name G. H. BENNETT.

